Before the development of the electric telephone, the term telephone was applied to other inventions, and not all early researchers of the electrical device used the term. Perhaps … See more

The invention of the transistor in 1947 dramatically changed the technology used in telephone systems and in the long-distance … See more

A mobile phone or cellphone or hand phone is a handheld telephone which connects via radio transmissions to a cellular telephone network. The cellular network consists of a … See more

• Brooks, John (1976). Telephone: The first hundred years. HarperCollins.
• Bruce, Robert V. (1990). Bell: Alexander Graham Bell and the … See more

Early telephones were technically diverse. Some used a water microphone, some had a metal diaphragm that induced current in an electromagnet wound around a permanent … See more

A cordless telephone or portable telephone consists of a base station unit and one or more portable cordless handsets. The base station connects to a telephone line, or … See more

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